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php基础篇-二维数组排序 array_multisort

原文:php基础篇-二维数组排序 array_multisort

对2维数组或者多维数组排序是常见的问题,在php中我们有个专门的多维数组排序函数,下面简单介绍下:

array_multisort(array1,sorting order, sorting type,array2,array3..)是对多个数组或多维数组进行排序的函数。

array1必需。规定输入的数组。
sorting order可选。规定排列顺序。可能的值是 SORT_ASC 和 SORT_DESC。
sorting type可选。规定排序类型。可能的值是SORT_REGULAR、SORT_NUMERIC和SORT_STRING。
array2可选。规定输入的数组。
array3可选。规定输入的数组。

参数中的数组被当成一个表的列并以行来进行排序 - 这类似 SQL 的 ORDER BY 子句的功能。第一个数组是要排序的主要数组。数组中的行(值)比较为相同的话,就会按照下一个输入数组中相应值的大小进行排序,依此类推。

第一个参数是数组,随后的每一个参数可能是数组,也可能是下面的排序顺序标志(排序标志用于更改默认的排列顺序)之一:

  • SORT_ASC - 默认,按升序排列。(A-Z)
  • SORT_DESC - 按降序排列。(Z-A)

随后可以指定排序的类型:

  • SORT_REGULAR - 默认。将每一项按常规顺序排列。
  • SORT_NUMERIC - 将每一项按数字顺序排列。
  • SORT_STRING - 将每一项按字母顺序排列

<?php	function my_sort($arrays,$sort_key,$sort_order=SORT_ASC,$sort_type=SORT_NUMERIC ){ 		if(is_array($arrays)){ 			foreach ($arrays as $array){ 				if(is_array($array)){ 					$key_arrays[] = $array[$sort_key]; 				}else{ 					return false; 				} 			} 		}else{ 			return false; 		}		array_multisort($key_arrays,$sort_order,$sort_type,$arrays); 		return $arrays; 	}	$person =  array(					array('id'=>1,'name'=>'fj','weight'=>100,'height'=>180),					array('id'=>2,'name'=>'tom','weight'=>53,'height'=>150),					array('id'=>3,'name'=>'jerry','weight'=>120,'height'=>156),					array('id'=>4,'name'=>'bill','weight'=>110,'height'=>190),					array('id'=>5,'name'=>'linken','weight'=>80,'height'=>200),					array('id'=>6,'name'=>'madana','weight'=>95,'height'=>110),					array('id'=>7,'name'=>'jordan','weight'=>70,'height'=>170)				);		var_dump($person);		$person = my_sort($person,'name',SORT_ASC,SORT_STRING);	var_dump($person);		$person = my_sort($person,'weight');	var_dump($person);?>

结果如下:
array (size=7)  0 =>     array (size=4)      ‘id‘ => int 1      ‘name‘ => string ‘fj‘ (length=2)      ‘weight‘ => int 100      ‘height‘ => int 180  1 =>     array (size=4)      ‘id‘ => int 2      ‘name‘ => string ‘tom‘ (length=3)      ‘weight‘ => int 53      ‘height‘ => int 150  2 =>     array (size=4)      ‘id‘ => int 3      ‘name‘ => string ‘jerry‘ (length=5)      ‘weight‘ => int 120      ‘height‘ => int 156  3 =>     array (size=4)      ‘id‘ => int 4      ‘name‘ => string ‘bill‘ (length=4)      ‘weight‘ => int 110      ‘height‘ => int 190  4 =>     array (size=4)      ‘id‘ => int 5      ‘name‘ => string ‘linken‘ (length=6)      ‘weight‘ => int 80      ‘height‘ => int 200  5 =>     array (size=4)      ‘id‘ => int 6      ‘name‘ => string ‘madana‘ (length=6)      ‘weight‘ => int 95      ‘height‘ => int 110  6 =>     array (size=4)      ‘id‘ => int 7      ‘name‘ => string ‘jordan‘ (length=6)      ‘weight‘ => int 70      ‘height‘ => int 170
array (size=7)  0 =>     array (size=4)      ‘id‘ => int 4      ‘name‘ => string ‘bill‘ (length=4)      ‘weight‘ => int 110      ‘height‘ => int 190  1 =>     array (size=4)      ‘id‘ => int 1      ‘name‘ => string ‘fj‘ (length=2)      ‘weight‘ => int 100      ‘height‘ => int 180  2 =>     array (size=4)      ‘id‘ => int 3      ‘name‘ => string ‘jerry‘ (length=5)      ‘weight‘ => int 120      ‘height‘ => int 156  3 =>     array (size=4)      ‘id‘ => int 7      ‘name‘ => string ‘jordan‘ (length=6)      ‘weight‘ => int 70      ‘height‘ => int 170  4 =>     array (size=4)      ‘id‘ => int 5      ‘name‘ => string ‘linken‘ (length=6)      ‘weight‘ => int 80      ‘height‘ => int 200  5 =>     array (size=4)      ‘id‘ => int 6      ‘name‘ => string ‘madana‘ (length=6)      ‘weight‘ => int 95      ‘height‘ => int 110  6 =>     array (size=4)      ‘id‘ => int 2      ‘name‘ => string ‘tom‘ (length=3)      ‘weight‘ => int 53      ‘height‘ => int 150
array (size=7)  0 =>     array (size=4)      ‘id‘ => int 2      ‘name‘ => string ‘tom‘ (length=3)      ‘weight‘ => int 53      ‘height‘ => int 150  1 =>     array (size=4)      ‘id‘ => int 7      ‘name‘ => string ‘jordan‘ (length=6)      ‘weight‘ => int 70      ‘height‘ => int 170  2 =>     array (size=4)      ‘id‘ => int 5      ‘name‘ => string ‘linken‘ (length=6)      ‘weight‘ => int 80      ‘height‘ => int 200  3 =>     array (size=4)      ‘id‘ => int 6      ‘name‘ => string ‘madana‘ (length=6)      ‘weight‘ => int 95      ‘height‘ => int 110  4 =>     array (size=4)      ‘id‘ => int 1      ‘name‘ => string ‘fj‘ (length=2)      ‘weight‘ => int 100      ‘height‘ => int 180  5 =>     array (size=4)      ‘id‘ => int 4      ‘name‘ => string ‘bill‘ (length=4)      ‘weight‘ => int 110      ‘height‘ => int 190  6 =>     array (size=4)      ‘id‘ => int 3      ‘name‘ => string ‘jerry‘ (length=5)      ‘weight‘ => int 120      ‘height‘ => int 156

这里的重点就是,先把要排序的key存到一个一维数组中,然后就可以使用array_multisort()这个函数,将数组按照key进行排序了,当然,这里的排序你完全可以不适用array_multisort()这个函数,仅仅通过foreach遍历也能达到这个效果,但是既然php开发者给我们提供了更好的办法,我们就可以省去不必要的麻烦了。

php基础篇-二维数组排序 array_multisort